雨刮连杆（不带电机）

The Ford 1704580 (also 4M51-17K484-AD / -AC / -AB / -AA) is the Front Wiper Linkage Assembly — the mechanical transmission frame that converts the wiper motor's rotary output into oscillating sweep — for the Ford Focus II Mk2 (DA / DB, 2004–2011) Hatchback / Saloon / Estate (Turnier), and the Ford C-Max / Focus C-Max Mk1 (DM2, 2003–2010). Compatible with all engine variants: 1.4 / 1.6 / 1.8 / 2.0 Duratec HE petrol, 1.6 LPG, 1.6 / 1.8 / 2.0 Duratorq TDCi diesel. Supplied without wiper motor — existing motor is transferred from the old linkage.

The linkage is a four-bar mechanism converting the motor's rotation into reciprocating angular displacement of two pivot posts — one per arm. The motor crank arm drives a primary connecting rod distributing motion through ball-and-socket joints to the pivot post arms. Each pivot mounts in a sealed bushing on the frame; outer taper splines accept the wiper arms. Four-bar geometry produces correct swept area and synchronises driver / passenger arcs without blade collision.

On Focus Mk2 / C-Max Mk1, the linkage uses a tandem opposed sweep configuration — both arms park at the screen base and sweep upward in opposite arcs meeting near centre. The frame carries the park position cam — a ramp on the connecting rod triggering the motor's park switch. Mounts to the scuttle panel via 3 or 4 bolts to the body reinforcement.

Linkages fail through ball-and-socket joint wear (play in rod ends), pivot post bearing corrosion from water ingress through blocked scuttle drains (causing seizure that overloads the motor), connecting rod fatigue fracture from ice / snow operation, and frame corrosion. A seized pivot is most damaging — the locked pivot stalls the motor and destroys its armature winding.

Wiper linkage assemblies (windscreen wipers) are typically classified under HS 8512.40 (windscreen wipers, defrosters and demisters of a kind used for cycles or motor vehicles), or under HS 8512.90 as parts thereof. Confirm the exact 10-digit subheading and applicable duty rates with your customs broker, particularly for European / Russian / CIS market shipments where the Ford Focus Mk2 / C-Max Mk1 fleet population is densest. Commercial invoice description: front wiper linkage assembly for passenger vehicle, mechanical four-bar linkage transmission with twin pivot posts, supplied without electric motor.

Does NOT fit: Ford Focus Mk1 (1998–2005) — predecessor with different scuttle / linkage; Ford Focus Mk3 (2010+) — later platform with redesigned wiper system; Ford C-Max Mk2 / Grand C-Max (2010+) — later platform; Ford Mondeo Mk3 / Mk4 / Mk5 — different vehicle, different linkage (BS71-17K484 series); Ford Fiesta (any generation) — different vehicle class with different linkage; Ford Galaxy / S-Max — different platform; US-market Ford Focus (any year) — uses 5S4Z / 7S4Z / 8S4Z series references; Right-hand-drive UK / Ireland / Australia / Japan domestic Focus Mk2 — uses mirror-image linkage with different OEM suffix; Volvo C30 / S40 / V50 — despite shared C1 platform with Focus Mk2, Volvo uses Volvo-specific scuttle / wiper linkage. Always verify by reading the OEM number stamped on the existing linkage.

Difficulty: Moderate. Estimated time: 60–90 minutes including scuttle drain inspection. The wiper motor is not supplied with the linkage — the existing motor must be transferred from the old linkage frame to the new frame.

1. 1
   Park the wipers in their normal park position by operating them and switching off. Mark each pivot post spline relative to its wiper arm with a paint pen. This reference allows the new linkage's splines to be indexed to the same positions, restoring the correct park and sweep without individual adjustment.
2. 2
   Remove both wiper arms using a wiper arm puller. Unscrew the cap nut at the base of each arm, install the puller, and apply steady force to release the arm from the splined post. Note the painted spline marks for re-indexing.
3. 3
   Remove the scuttle / cowl panel at the base of the windscreen. On Focus Mk2 / C-Max Mk1, the scuttle is held by plastic clips and a few screws — lift carefully to avoid breaking clips. Disconnect the windscreen washer hose if it crosses the scuttle.
4. 4
   Disconnect the wiper motor electrical connector. Note the connector orientation. Remove the linkage frame mounting bolts from the scuttle panel reinforcement (typically 3 or 4 bolts). Lift the complete linkage + motor assembly out of the scuttle area.
5. 5
   Transfer the wiper motor from old linkage to new frame. Remove motor mounting bolts (typically 3 small bolts). Note motor crank position vs linkage drive pin — crank angle determines sweep arc and park phase. Photograph original angle before removal.
6. 6
   Confirm all new linkage ball-and-socket joints move freely through their full range. Flex each joint and confirm smooth, rattle-free motion without binding. Apply a small quantity of lithium grease to any joint that feels dry.
7. 7
   Mount the wiper motor on the new linkage frame at the original crank-to-pin angle (referencing your photograph). Torque the motor bolts to OEM spec (typically 8–10 Nm). Reconnect the motor electrical connector.
8. 8
   Confirm scuttle drain tubes are clear. Blocked drainage is primary cause of pivot corrosion on Focus Mk2 / C-Max Mk1. Use flexible probe to clear debris. Drains exit at the front wheel arch.
9. 9
   Install the new linkage assembly onto the scuttle panel, aligning the mounting holes with the body reinforcement bolts. Torque the frame mounting bolts to OEM spec (typically 8–15 Nm into the scuttle reinforcement). The frame must be fully seated for correct pivot post geometry.
10. 10
    Refit the wiper arms to the indexed positions on the new pivot post splines, matching the original paint marks. The arm spline taper engages the post taper — press the arm down firmly and torque the cap nut to OEM spec (typically 12–18 Nm).
11. 11
    Refit scuttle cover, reconnect washer hose if disturbed. Activate wipers at all speeds: blades sweep to correct arcs without pillar contact; park at screen base; quiet operation. Adjust arm spline indexing if park position incorrect.